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Finding the Fourth Proportional to 259,855.80, 389,784.66 and 79,939.98

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Solution

The fourth proportional to 259,855.80, 389,784.66 and 79,939.98 is: 119,910.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,855.80 : 389,784.66 = 79,939.98 : x
  2. Step 2: Convert to fraction form
    259,855.80/389,784.66 = 79,939.98/x
  3. Step 3: Cross multiply
    259,855.80x = 389,784.66 × 79,939.98
  4. Step 4: Simplify right side
    259,855.80x = 31,159,377,924.71
  5. Step 5: Solve for x
    x = 31,159,377,924.71/259,855.80
  6. Step 6: Final answer
    x = 119,910.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.